The DVL 8 Double Wall Black Tee with Clean-out Cap is a component that is used in a typical venting installation. Use with rear exit appliances and appliances that require a barometric damper.Fuel Type: Wood Length: 8 Material: 26 Gauge Aluminized Steel Pipe Class: Stove Pipe Pipe Inside Diameter: 8 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 6